import re
text = '''
It was a bright cold day in April, and the clocks were
striking thirteen. Winston Smith, his chin nuzzled into
his breast in an effort to escape the vile wind, slipped
quickly through the glass doors of Victory Mansions,
though not quickly enough to prevent a swirl of gritty
dust from entering along with him.
-- George Orwell, 1984
'''

#找出所有重复字母出现的单词，以list返回
def calc():
    return None

def test_calc():
    assert calc() == [('thirteen.', 'e'), ('nuzzled', 'z'), ('effort', 'f'), ('slipped', 'p'), ('glass', 's'), ('doors', 'o'), ('gritty', 't'), ('--', '-'), ('Orwell,', 'l')]

